Arctosa labiata, Tso & Chen, 2004

Tso, I-Min & Chen, Jun, 2004, Descriptions Of Three New And Six New Record Wolf Spider Species From Taiwan (Arachnida: Araneae: Lycosidae), Raffles Bulletin of Zoology 52 (2), pp. 399-411 : 401-402

Arctosa labiata , new species

( Figs. 6-10 )

Material examined. – Holotype - female, Kenting National Park , Pingtong County, Taiwan, Jun.2000, coll. Yu-Lung Hsieh (NMNS- THU-Ar-01-0108).

Paratypes – 1 female, Hui-Sun Experimental Forest Station , Nantou County, Taiwan, Aug.1998, coll. Hai-Yin Wu ( ZRC) ; 1 female, Lugu Country , Nantou County, Taiwan, 29 Jan.1996, coll. Wen-Hao Chou (NMNS-THU-Ar-02-0155, in IZCAS, Beijing) ; 1 male, Hui-Sun Experimental Forest Station , Nantou County, Taiwan, Apr.1998, coll. Hai-Yin Wu ( ZRC) ; 1 male, Hui-Sun Experimental Forest Station , Nantou County, Taiwan, Apr.1998, coll. Hai-Yin Wu (NMNS-THU-Ar-00-0065) ; 7 males, Kenting National Park , Pingtong County, Taiwan, Apr.2000, coll. Yu-Lung Hsieh (NMNS- THU-Ar-01-0107, 5 in NMNS, Taiwan; 2 in IZCAS, Beijing) .

Diagnosis. – Total length 3.92-5.33; carapace with indistinct pattern; epigynum lip-shaped, posterior margin almost straight, copulatory tube long and strongly twisted; median apophysis of pedipalp organ directed laterally, anterior margin concave, distal part pointed, curved ventrally, embolus long and narrowed distally, terminal apophysis bifurcate distally, upper branch wide and obtuse.

Etymology. – The specific name refers to the lip-shaped epigynum of the new species.

Description. – Female: Total length: 5.03-5.33. Holotype: total length 5.33, carapace length 2.51, width 1.75; abdomen length 2.94, width 1.84. Body with brown pubescence. Head region sloped laterally. Carapace reddish-brown, with indistinct pattern. Quadrangle of the posterior eyes dark brown, scattered with whitish pubescence and brownish long setae, colour between PLEs reddish-brown. Anterior eye row slightly recurved, slightly longer than posterior median eye row, AME slightly smaller than ALE, AME-AME longer than AME-ALE. Clypeus about same length of the diameter of AME. Chelicerae with 3 promarginal and 4 retromarginal teeth. Sternum slightly swollen, colour of margin rather dark. Legs with distinct annulations. Legs measurements: I 5.39 (1.59, 0.86, 1.16, 1.04, 0.74); II 4.90 (1.53, 0.80, 0.98, 0.92, 0.67); III 4.85 (1.35, 0.74, 0.86, 1.10, 0.80); IV 7.17 (1.96, 0.92, 1.35, 1.96, 0.98). Dorsum of abdomen longitudinally with several pairs of pale spots behind the heart stripe. Median septum of epigynum lip-shaped, posterior margin almost straight ( Fig. 6 ), copulatory opening invisible, copulatory tube long and strongly twisted, spermatheca expanded, round ( Fig. 7 ).

Male: Total length 3.92-5.09. One paratype: total length 5.09, carapace length 2.64, width 1.84; abdomen length 2.57, width 1.53. Similar to female in general shape and colour. Body slightly dark. Anterior eye row almost straight, AME-AME slightly longer than AME-ALE. Sternum brown. Femura of legs brown, other segments yellowish-brown, with distinct annulations. Legs measurements: I 5.96 (1.72, 0.92, 1.29, 1.23, 0.80); II 5.09 (1.53, 0.86, 0.80, 1.16, 0.74); III 5.10 (1.41, 0.74, 0.86, 1.35, 0.74); IV 7.42 (2.02, 0.92, 1.41, 2.15, 0.92). Cymbium of pedipalp with two thick apical setae. Median apophysis directed laterally, anterior margin concave, distal part pointed, curved ventrally; embolus long and narrowing distally, distal part thin and long; terminal apophysis bifurcate distally, upper branch wide and obtuse.

Remarks. – This species is very similar to A. meitanensis Yin et al., 1993 . It differs from the latter by following: in A. labiata , posterior margin of median septum almost straight, copulatory opening invisible, copulatory tube long and strongly twisted, upper branch of terminal apophysis wide and obtuse; in A. meitanensis , posterior margin of median septum arched distinctly, copulatory opening visible, copulatory tube short and slightly curved, upper branch of terminal apophysis narrow, pointed, digitiform.

Distribution. – Taiwan.

Figures

Figs. 6-10. Arcotosa labiata, new species. 6-7. epigynum (6. ventral view; 7. dorsal view); 8-9. left pedipalp of male (8. ventral view; 9. retrolateral view); 10. terminal part of right pedipalp (ventral view). Abbreviations:ct: copulatory tube; em: embolus; ma: median apophysis; ms: median septum; sp: spermatheca; st: subtegulum; t: tegulum; ta: terminal apophysis. Scale bars: Figs. 6-9 = 0.15mm; Fig. 10 = 0.10mm.